2166171656 has 32 divisors (see below), whose sum is σ = 4434933600. Its totient is φ = 983706240.

The previous prime is 2166171653. The next prime is 2166171701. The reversal of 2166171656 is 6561716612.

It is not an unprimeable number, because it can be changed into a prime (2166171653) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88451 + ... + 110253.

It is an arithmetic number, because the mean of its divisors is an integer number (138591675).

Almost surely, 2^2166171656 is an apocalyptic number.

It is an amenable number.

2166171656 is an abundant number, since it is smaller than the sum of its proper divisors (2268761944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2166171656 is a wasteful number, since it uses less digits than its factorization.

2166171656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22949 (or 22945 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 2166171656 is about 46542.1492413060. The cubic root of 2166171656 is about 1293.8907942147.

The spelling of 2166171656 in words is "two billion, one hundred sixty-six million, one hundred seventy-one thousand, six hundred fifty-six".